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检索课题：全级配混凝土动力特性的细观模拟英文数据库1 题名Tensile strength of concrete under and intermediate strain rates作者Shengxing Wu,Xudong Chen,Jikai Zhou文献出处Nuclear Engineer and Design年2012期 4页码p173-183检索词Tensile strength of concrete检索方式基本检索检索数据库EBSCO外文期刊全文数据库检索年限2010-至今检索内容和结果：This paper presents the results of an experimental investigation into the strength, deformation, and fracture behaviour of textile-reinforced concrete (TRC) subjected both to low and high-rate tensile loading ranging from 0.0001 to 50 s−1. High strain rates were achieved using high-rateservo-hydraulic testing machine. The effect of the addition of short fibres on the static and dynamic response of TRC has been investigated, and the microstructure of both composite and fibre was observed after the tests using an ESEM. An increase in tensile strength, strain capacity, and work-to-fracture was observed for strain rates up to 0.1 s−1 with increasing strain rate. The addition of short glass fibres increased the tensile strength and first crack strength of the TRC. For high-speed tests (rates above 5 s−1) an increase in the tensile strength, first crack strength and work-to-fracture was also observed, but at the same time there was a decrease in the strain capacity. The tests at high loading rates showed a pronounced effect of the specimen length on the measured mechanical properties: with increasing gauge length the tensile strength and strain capacity decreased, while the work-to-fracture increased.2 题名Analysis and modelling of the cohension strength of concrete at high strain rates作者 B. Erzar1P. Forquin.1文献出处International Journal of Solids and Structures年2014期15页码p2559-2574检索词concrete at high strain rates检索方式基本检索检索数据库EBSCO外文期刊全文数据库检索年限2010-至今检索内容和结果：In the paper, an identification approach based on a Genetic Algorithm (GA) is applied to the case study of a base-isolated, post-tensioned concrete bridge investigated in earlier contributions of literature. It is known that bearing isolators greatly influence the overall response of small- and medium-span bridges under dynamic loads, but in previous works it was seen that the characterisation of their elastic stiffness under small displacements may be inaccurate. In thiswork, based on in-situ test measurements obtained under static and dynamic loading conditions, inverse techniques based on GAs are successfully applied to the examined structural system, providing an efficient and well-calibrated structural identification of itsmain properties. Compared to other identification tools and classical correlation techniques, the main advantage deriving from the use of inverse approaches based on GAs typically manifests in the possibility to estimate a greater number of material parameters (e.g. properties of concrete as well as stiffness of the bearing isolators, etc.), and to critically assess the accuracy of the identification. Based on rather good correlation between test measurements and finite element (FE) model updating, it is expected that the same technique could be applied to various structural typologies and systems.3 题名Strain rate effect on the behavior of textile-reinforced concrete under static and dynamic loading作者Flavio de Andrade Silva a, Marko Butler a, Viktor Mechtcherine a,∗, Deju Zhu b, Barzin Mobasher b文献出处Materials Science and Engineering A年2011卷93页码p1727-1734检索词bond of FRP bar and concrete检索方式基本检索检索数据库Sciencedirect检索年限2010-至今检索内容和结果：With the exponential increase of computational power, numerical simulations are more and more used to model the response of concrete structures subjected to dynamic loadings such as detonation near a concrete structural element or projectile-impact. Such loadings lead to intense damage modes resulting from high strain-rate tensile loadings in the concrete structure. However, the modelling of the post-peak tensile response of concrete still remains difficult due to the lack of experimental data at high strain-rates.This work aims at improving the modelling of the softening behaviour of concrete based on the following statement: despite the propagation of unstable cracks in the tested specimen cohesion strength exists in the vicinity of triggered cracks and is driving the whole softening behaviour of concrete. This statement is justified in the present work by means of experiments and Monte-Carlo calculations: firstly, concrete samples have been subjected to a dynamic tensile loading by means of spalling experiments. Several specimens have been recovered in a damaged but unbroken state and have been subsequently loaded in quasi-static tensile experiments to characterise the residual strength and damage level in the sample.In addition, Monte-Carlo simulations have been conducted to clarify the possible influence of cohesion strength in the vicinity of cracks. Finally, the DFH (Denoual–Forquin–Hild) anisotropic damage model has been adapted to take into account the cohesion strength in the damaged zone and to describe the softening behaviour of concrete. Numerical simulations of experiments conducted on dry and saturated samples at different levels of loading-rate illustrate the new capability of the model.中文数据库4 题名全级配混凝土动态轴拉试验作者张艳红，胡晓，杨陈，李春雷，朱红东，焦健文献出处水利学报年2014期 6页码p720-727检索词全级配混凝土动力特性的细观模拟检索方式基本检索检索数据库读秀知识库检索年限2000-至今检索内容和结果：轴向拉伸试验是确定混凝土拉伸断裂特性最直接的方法。